Respuesta :
3-1= 2
5-9= -4 or 4 depending if you meant 9-5 and if so then it would be 4
5-9= -4 or 4 depending if you meant 9-5 and if so then it would be 4
Step by Step through PEMDAS:
1) 3-15-9
2) -12 - 9
3) -21
...Hope it helps...
1) 3-15-9
2) -12 - 9
3) -21
...Hope it helps...